Question

In the given rhombus ABCD ,the measure of angle OAB is​

Answer 1

Answer:

given,<CBO=100

THEREFORE,<DAB=180-100=80(ADJESENT ANGLES)

SO,<OAB=80/2=40°

Step-by-step explanation:

Answer 2

Answer:

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Step-by-step explanation:

∠ABC = 100

∴ ∠ABO = 50 {∵ Bisectors cut things in half}

we know that sum of angles of a triangle = 180

∴ ∠OAB + ∠ABO +∠AOB = 180

∠OAB + 50 + 90 = 180

∴ ∠OAB = 40 {180 - (50+40)}